|This shows the stages in changing the as-is Shroud Scope image (far left) to the final tweaked version (far right). Click to ENLARGE|
This is a follow-on from the last but one posting, which reported evidence that an 'official' Halta Definizione image of the Turin Shroud, displayed 4 years ago on the BBC's website, was apparently two-tone (generally a nondescript grey in colour, but a much brighter orange-brown at a few locations).
The orange-brown parts subjectively have the appearance of pressure and/or thermal imprints, possibly contact scorches, being interpretable as parts of the naked human anatomy with the highest relief, and thus most likely to make immediate and direct contact with an enveloping linen sheet.
However, some difficulty was experienced in eliciting the same two-tone pattern from the more comprehensive Shroud Scope, which is available free on the internet, thanks to the initiative of Canadian IT specialist and Shroud authority, Mario Latendresse.
That difficulty has now been overcome with a patient exploration of brightness/contrast/mid tone(BCM) settings in MS Office Picture Manager.
This posting will serve simply to flag up the two-tone effect, which this blogger has not previously heard mention in some 3 years of reading and research. The question of whether it's an artefact of "playing around" with a photo-editing software package is one that will be deferred for now. Suffice it to say that if I thought for one moment that were the case, then I would not still be pursuing it now, far less posting to the Web.
First, let me introduce the new settings that were needed with Shroud Scope. They were BCM -76/70/60 respectively, radically different from those used with the Halta image (31,36,100). Despite that large difference, the new settings, as with the old, produced relatively little change with a carefully chosen photograph of thermally-developed 'invisible ink' scorches on linen (one of may possible origins of the TS image, but included here as a current research preoccupation, indeed working model).
|Left: photograph 'as is'; Right, after applying BCM = -76/70/60 in MS Office Picture Manager. Note the modest augmentation of stain intensity without major colour differences, within or without the circled areas.|
The next graphic shows the effect of applying those same settings to Shroud Scope images, starting with the dorsal side.
|Before applying new settings (click to ENLARGE)|
|After applying new settings (click to ENLARGE)|
Note that no one site makes a complete case for there being a two-tone distribution that is independent of the prolifeartion of scourge marks, or for the orange-brown coloration being specifically a feature where bony or other prominence makes physical contact with linen. One has to look at ALL the sites to get a balanced view.
So let's not forget the frontal side before taking a break here:
|Frontal side, Shroud Scope, before making adjustments (click to ENLARGE)|
|The same, after applying BCM = -76/70/60 (click to ENLARGE)|
Still doubtful dear reader? Then take a look at this one, hot from the presses.
Here I've made a very small adjustment to the mid-tone value, from 60 down to 52, because it seemed to be optimising that crucial difference between the two colorations, on a location where it is possible to deduce where there is more or less easier contact between linen and flesh, e.g. backs of hands a certainty, the region around the hands much less certain. It is this kind of assessment where one compares colorations with known sites and their ease of access that gradually builds confidence that the colour differences are real (even of the absolute hues are not), and not trivial artefacts. I've also left the flags etc in the above picture, to show how little change there is after making these adjustments in Picture Manager.
Here's the Shroud Scope starter image for comparison:
I'll be back later with my interpretation of the two-tone effect. It was previously flagged up in my last-but-one posting, but being (admittedly) over-long is now somewhat difficult to find. It won't hurt to repeat it here. Or there again, it may, conceivably just may, there being some folk in this fractious old world who don't care one bit for my anti-authenticity line. But have they been reading AND researching for nigh on three years? Well, I have, and there comes a time when one's thoughts start to crystallize. So why hold back? Tell folk what one really thinks. Don't beat about the bush.
Afterthought: so which image provided a better demonstration of two-tone properties. Was it the Halta Definizione picture off the BBC site:
or was it the comparable Shroud Scope picture in today's posting?
I'd say it was a close call, but one of them has the edge.